Skip to main content
. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Prog Nucl Magn Reson Spectrosc. 2014 Mar 7;79:14–47. doi: 10.1016/j.pnmrs.2014.02.001

Fig. 18.

Fig. 18

A. Sagittal T2-weighted 1H MR image (left) of the right knee with an osteochondral allograft transplantation (arrowhead) at the weight-bearing aspect of the medial femoral condyle. There is synovial fluid at the articular surface (arrows) in the conventional 23Na TSC map (middle). Hyperintense signal is seen from synovial fluid at the articular surface (arrows) and to a lesser extent in a subchondral location at the repair site (arrowhead). On the TSC map from 23Na-IR MRI (right), there is a visible suppression of signal from free sodium within synovial fluid (arrows) and also in the subchondral location (arrowhead). B. Axial T2-weighted 1H MR image (left) of the right knee, with a juvenile cartilage cell implantation (arrowhead) at the medial facet of the patella. Structures containing free sodium, such as synovial fluid and popliteal vessels, are indicated by arrows. On the conventional 23Na TSC map (middle), hyperintense signal is seen from synovial fluid at the articular surface and within the popliteal vessels (arrows). On the 23Na-IR TSC map (right panel), a suppression of signal from free sodium within synovial fluid and within popliteal vessels is visible (arrows). The calibration phantoms are seen at top left of the sodium images. Reproduced with permission from Ref. [87].